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HOMESERVICE MANUALSDODGE AND RAM1990SHADOW ES, 2D HATCHBACK, 2.2 CREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - MANUALTESTINGLOW PRESSURE CUT-OFF SWITCH TEST3.0L & 3.3L ENGINES
1990 Dodge and Ram Shadow ES, 2D Hatchback, 2.2 C

3.0L & 3.3L Engines

1990 Dodge and Ram Shadow ES, 2D Hatchback, 2.2 CSECTION 3.0L & 3.3L Engines
  1. Remove protective boot from switch and jumper leads together. Press A/C button to on.
  2. Momentarily turn ignition on while listening for compressor clutch to engage. If clutch does not engage, ambient sensor switch or fuse may be defective. Also check clutch circuit and clutch.
  3. If clutch engages, install a manifold gauge set and read compressor discharge pressure. At pressures of 41 psi (2.9 kg/cm2 ) and above, at a minimum ambient temperature of 50°F (10°C), switch should activate compressor clutch.
  4. If compressor discharge pressure is below 46 psi (3.2 kg/cm2 ), refrigerant is low and is probably leaking from system. Repair leak, reconnect electrical connector and return to step 2). If clutch does not engage, replace switch.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.